<?php

class Magentochina_Bundlepromotion_Model_Mysql4_Bundlepromotion extends Mage_Core_Model_Mysql4_Abstract
{
    public function _construct()
    {    
        // Note that the bundlepromotion_id refers to the key field in your database table.
        $this->_init('bundlepromotion/bundlepromotion', 'bundlepromotion_id');
    }
}